#header{
	height: 80px;
	background: lightgray;
}

#footer {
	height: 50px;
	background: lightgray;
}

#content .main {
	height: 500px;
	background: white;
	overflow: auto;
}

#content .aside {
	height: 500px;
	width: 200px;
	background: gray;
	float: left;
	color: yellow;
}

* {
	margin: 0;
	padding: 0;
	font-size: 14px;
}

a {
	/* color: #333; */
	/* text-decoration: none */
}

.nav {
	list-style: none;
	height: 30px;
	border-bottom: 10px solid #F60;
	/* margin-top: 20px; */
	padding-left: 50px;
}

.nav li {
	float: left
}

.nav li a {
	display: block;
	height: 30px;
	text-align: center;
	line-height: 30px;
	width: 80px;
	background: #efefef;
	margin-left: 1px;
}

.nav li a.on, .nav li a:hover {
	background: #F60;
	color: #fff;
}